Master cylinder "gasket" to firewall with integrated bellows seal retainer.

Depending on thickness you could use sill gasket that framers use.
When you say "nylon plate" are you meaning the part Dana has made?
ajarofclay said
There's a foam gasket that goes between the master and the nylon plate but nothing between the plate and the firewall. I'll probably put something there even if it's just making my own gasket.
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